The Iraqi Journalists' Union wants a government investigation into a deadly shooting by a US helicopter gunship two years ago that was revealed with the release of a graphic video.

The Iraqi Journalists' Union wants a government investigation into a deadly shooting by a US helicopter gunship two years ago that was revealed with the release of a graphic video. The clear black-and-white footage shot in Baghdad by one of the Apache gunships involved shows a July 12, 2007, attack on a group the pilots said they believed to be carrying weapons.

It was posted anonymously Monday on Wikileaks.org and authenticated by a senior US military official. Among those believed killed were Reuters photographer Namir Noor-Eldeen and his assistant Saeed Chmagh.

Union chief Mouyyad al-Lami said Tuesday the footage is evidence of a crime and should be investigated.